European space scientists are getting closer to unravel the origin of Mars' larger moon, Phobos. Thanks to a series of close encounters by ESA's Mars Express spacecraft and images captured by the High Resolution Stereo Camera (HRSC), operated by the German Aerospace Center (DLR), the moon looks almost certain to be a 'rubble pile', rather than a single solid object. However, mysteries remain about where the rubble came from.

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